11+ Uml Abstract Class Notation. Note, that uml's 1.4 anchor. No object may be a direct instance of an abstract class.
In this example the tapeplayer class must implement the operations in the recorder interface. This example below is hard to understand. Relationships in uml class diagrams.
It stands for the idea of a relationship between system components.
11+ Uml Abstract Class Notation. No object may be a direct instance of an abstract class. As modeling omits unimportant details, it is easier to manipulate than the original entity. The figure below shows an example of inheritance. The modeling language uml is an iso standard.